| Lateinischer name | Allgemeiner name | Familie | ||
| Penstemon rattanii Gray var. rattanii Gray [superfluous autonym] | >>Penstemon rattanii |
Scrophulariaceae |
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| Penstemon retrorsus Payson ex Pennell | Adobe Hills beardtongue |
Scrophulariaceae |
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| Penstemon rhizomatosus N. Holmgren | Scheel Creek beardtongue |
Scrophulariaceae |
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| Penstemon richardsonii Dougl. ex Lindl. | cutleaf beardtongue |
Scrophulariaceae |
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| Penstemon richardsonii Dougl. ex Lindl. ssp. curtiflorus Keck | >>Penstemon richardsonii var. curtiflorus |
Scrophulariaceae |
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| Penstemon richardsonii Dougl. ex Lindl. ssp. dentatus Keck | >>Penstemon richardsonii var. dentatus |
Scrophulariaceae |
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| Penstemon richardsonii Dougl. ex Lindl. var. curtiflorus (Keck) Cronq. | cutleaf beardtongue |
Scrophulariaceae |
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| Penstemon richardsonii Dougl. ex Lindl. var. dentatus (Keck) Cronq. | cutleaf beardtongue |
Scrophulariaceae |
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| Penstemon richardsonii Dougl. ex Lindl. var. richardsonii | Richardson s penstemon |
Scrophulariaceae |
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| Penstemon roezlii Regel | Roezl s penstemon |
Scrophulariaceae |
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| Penstemon rostriflorus Kellogg | Bridge penstemon |
Scrophulariaceae |
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| Penstemon rothrockii Gray | >>Keckiella rothrockii ssp. rothrockii |
Scrophulariaceae |
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| Penstemon rothrockii Gray ssp. jacintensis (Abrams) Keck | >>Keckiella rothrockii ssp. jacintensis |
Scrophulariaceae |
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| Penstemon rubicundus Keck | Wassuk Range beardtongue |
Scrophulariaceae |
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| Penstemon rupicola (Piper) T.J. Howell | cliff beardtongue |
Scrophulariaceae |
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| Penstemon rydbergii A. Nels. | Rydberg s penstemon |
Scrophulariaceae |
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| Penstemon rydbergii A. Nels. ssp. aggregatus (Pennell) Keck | >>Penstemon rydbergii var. aggregatus |
Scrophulariaceae |
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| Penstemon rydbergii A. Nels. var. aggregatus (Pennell) N. Holmgren | meadow beardtongue |
Scrophulariaceae |
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| Penstemon rydbergii A. Nels. var. oreocharis (Greene) N. Holmgren | herbaceous penstemon |
Scrophulariaceae |
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| Penstemon rydbergii A. Nels. var. rydbergii | swollen penstemon |
Scrophulariaceae |
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| Penstemon rydbergii A. Nels. var. varians (A. Nels.) Cronq. | >>Penstemon rydbergii var. rydbergii |
Scrophulariaceae |
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| Penstemon saxosorum Pennell | upland beardtongue |
Scrophulariaceae |
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| Penstemon scapoides Keck | pinyon beardtongue |
Scrophulariaceae |
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| Penstemon scariosus Pennell | White River beardtongue |
Scrophulariaceae |
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| Penstemon scariosus Pennell var. albifluvis (England) N. Holmgren | White River beardtongue |
Scrophulariaceae |
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| Penstemon scariosus Pennell var. cyanomontanus Neese | Neese s Blue Mountain beardtongue |
Scrophulariaceae |
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| Penstemon scariosus Pennell var. garrettii (Pennell) N. Holmgren | Garrett s beardtongue |
Scrophulariaceae |
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| Penstemon scariosus Pennell var. scariosus | White River beardtongue |
Scrophulariaceae |
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| Penstemon Schmidel | beardtongue |
Scrophulariaceae |
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| Penstemon scouleri Lindl. | >>Penstemon fruticosus var. scouleri |
Scrophulariaceae |
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| Penstemon secundiflorus Benth. | sidebells penstemon |
Scrophulariaceae |
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| Penstemon seorsus (A. Nels.) Keck | shortlobe penstemon |
Scrophulariaceae |
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| Penstemon sepalulus A. Nels. | littlecup beardtongue |
Scrophulariaceae |
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| Penstemon serrulatus Menzies ex Sm. | serrulate penstemon |
Scrophulariaceae |
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| Penstemon shastensis Keck | >>Penstemon heterodoxus var. shastensis |
Scrophulariaceae |
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| Penstemon smallii Heller | Small s beardtongue |
Scrophulariaceae |
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| Penstemon spatulatus Pennell | Wallowa beardtongue |
Scrophulariaceae |
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| Penstemon speciosus Dougl. ex Lindl. | royal penstemon |
Scrophulariaceae |
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| Penstemon speciosus Dougl. ex Lindl. ssp. kennedyi (A. Nels.) Keck | >>Penstemon speciosus |
Scrophulariaceae |
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| Penstemon speciosus Dougl. ex Lindl. ssp. lemhiensis Keck | >>Penstemon lemhiensis |
Scrophulariaceae |
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| Penstemon spectabilis Thurb. ex Gray | showy penstemon |
Scrophulariaceae |
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| Penstemon spectabilis Thurb. ex Gray ssp. spectabilis | showy penstemon |
Scrophulariaceae |
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| Penstemon spectabilis Thurb. ex Gray ssp. subviscosus Keck | showy penstemon |
Scrophulariaceae |
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| Penstemon spectabilis Thurb. ex Gray var. subviscosus (Keck) McMinn | >>Penstemon spectabilis ssp. subviscosus |
Scrophulariaceae |
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| Penstemon spectabilis Thurb. var. spectabilis Thurb. [superfluous autonym] | >>Penstemon spectabilis |
Scrophulariaceae |
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| Penstemon spinulosus Woot. & Standl. | >>Penstemon heterophyllus ssp. purdyi |
Scrophulariaceae |
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| Penstemon stenophyllus (Gray) T.J. Howell | Sonoran beardtongue |
Scrophulariaceae |
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| Penstemon stephensii Brandeg. | Stephens penstemon |
Scrophulariaceae |
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| Penstemon strictiformis Rydb. | Mancos penstemon |
Scrophulariaceae |
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| Penstemon strictus Benth. | Rocky Mountain penstemon |
Scrophulariaceae |
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| Penstemon strictus Benth. ssp. angustus Pennell | >>Penstemon strictus |
Scrophulariaceae |
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| Penstemon strictus Benth. ssp. strictiformis (Rydb.) Keck | >>Penstemon strictiformis |
Scrophulariaceae |
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| Penstemon subglaber Rydb. | smooth penstemon |
Scrophulariaceae |
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| Penstemon subserratus Pennell | finetooth beardtongue |
Scrophulariaceae |
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| Penstemon subulatus M.E. Jones | hackberry beardtongue |
Scrophulariaceae |
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| Penstemon sudans M.E. Jones | Susanville beardtongue |
Scrophulariaceae |
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| Penstemon suffrutescens Rydb. | >>Penstemon crandallii ssp. crandallii |
Scrophulariaceae |
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| Penstemon superbus A. Nels. | superb beardtongue |
Scrophulariaceae |
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| Penstemon tenuiflorus Pennell | eastern whiteflower beardtongue |
Scrophulariaceae |
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| Penstemon tenuis Small | sharpsepal beardtongue |
Scrophulariaceae |
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| Penstemon ternatus Torr. ex Gray | >>Keckiella ternata ssp. ternata |
Scrophulariaceae |
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| Penstemon ternatus Torr. ex Gray ssp. septentrionalis (Munz & Johnston) Keck | >>Keckiella ternata ssp. septentrionalis |
Scrophulariaceae |
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| Penstemon teucrioides Greene | germander beardtongue |
Scrophulariaceae |
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| Penstemon thompsoniae (Gray) Rydb. | Thompson s beardtongue |
Scrophulariaceae |
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| Penstemon thompsoniae (Gray) Rydb. ssp. jaegeri Keck | Jaeger s beardtongue |
Scrophulariaceae |
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| Penstemon thompsoniae (Gray) Rydb. ssp. thompsoniae | Thompson s beardtongue |
Scrophulariaceae |
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| Penstemon thompsoniae (Gray) Rydb. var. desperatus Neese | >>Penstemon thompsoniae ssp. thompsoniae |
Scrophulariaceae |
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| Penstemon thurberi Torr. | Thurber s penstemon |
Scrophulariaceae |
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| Penstemon thurberi Torr. var. anestius Reveal & Beatley | >>Penstemon thurberi |
Scrophulariaceae |
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| Penstemon tidestromii Pennell | Tidestrom s beardtongue |
Scrophulariaceae |
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| Penstemon tiehmii N. Holmgren | Tiehm s beardtongue |
Scrophulariaceae |
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| Penstemon tolmiei Hook. | >>Penstemon procerus var. tolmiei |
Scrophulariaceae |
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| Penstemon tolmiei Hook. ssp. brachyanthus (Pennell) Keck | >>Penstemon procerus var. brachyanthus |
Scrophulariaceae |
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| Penstemon tolmiei Hook. ssp. formosus (A. Nels.) Keck | >>Penstemon procerus var. formosus |
Scrophulariaceae |
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| Penstemon torreyi Benth. | >>Penstemon barbatus ssp. torreyi |
Scrophulariaceae |